Manicouagan impact crater

Manicouagan crater

The Manicouagan Crater is one of the oldest known impact craters and is the largest 'visible' impact crater on Earth, located primarily in Manicouagan Regional County Municipality in the Côte-Nord region of Québec, Canada, about 300 km (190 mi) north of the city of Baie-Comeau. At roughly 213-215 million years old, Manicouagan is one of the oldest large astroblemes still visible on the surface. Its northernmost part is located in Caniapiscau Regional County Municipality. It is thought to have been caused by the impact of a 5 km (3 mi) diameter asteroid about 215.5 million years ago (Triassic Period).^[2] It was once thought to be associated with the end-Carnian extinction event.

• http://en.wikipedia.org/wiki/Manicouagan crater